GB466981A - Improvements in or relating to antenna coupling devices - Google Patents

Improvements in or relating to antenna coupling devices

Info

Publication number
GB466981A
GB466981A GB9136/36A GB913636A GB466981A GB 466981 A GB466981 A GB 466981A GB 9136/36 A GB9136/36 A GB 9136/36A GB 913636 A GB913636 A GB 913636A GB 466981 A GB466981 A GB 466981A
Authority
GB
United Kingdom
Prior art keywords
coil
wave
long
medium
coils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB9136/36A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Philco Radio and Television Corp
Original Assignee
Philco Radio and Television Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philco Radio and Television Corp filed Critical Philco Radio and Television Corp
Publication of GB466981A publication Critical patent/GB466981A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

466,981. Wireless receiving circuits. PHILCO RADIO & TELEVISION CORPORATION. March 27, 1936, No. 9136. Convention date, April 8, 1935. [Class 40 (v)] A wave trap is provided to suppress medium wave image frequencies when a set is receiving long-wave stations and switching means is provided for making the long and medium wave receiving coils ineffective when medium and long waves respectively are being received. If necessary a long-wave trap may also be used when the set is switched for medium wave reception. When the set is to receive long-wave stations, the switches S1, S2, are in positions B, B1 ; coil L2 is shorted to earth and coils L1, L4 are in series but only coil L4 is coupled to the secondary circuit. Coil L1 is broadly resonant to the medium wave frequency band and presents a very high impedance to medium wave signals whilst the suppression of the signals is further enhanced by the shorting of coil L2 to earth. The coil L1 is of low impedance compared with the coil L4 for the long wave signals, which it is desired to receive. When the switches S1, S2 are in positions A, A1 the coils L1, L4 are in shunt relation with the coil L2 and coil L5 is shorted. Image rejection in this frequency band occurs by virtue of the location of the intermediate frequency but if necessary a parallel tuned trap may be provided. The coil Cl serves as a pad for the tuning condenser VC when the switch S1 is in position B and as a coupling impedance only when the switch is in position A.
GB9136/36A 1935-04-08 1936-03-27 Improvements in or relating to antenna coupling devices Expired GB466981A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15333A US2050912A (en) 1935-04-08 1935-04-08 Antenna coupling device

Publications (1)

Publication Number Publication Date
GB466981A true GB466981A (en) 1937-06-09

Family

ID=21770811

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9136/36A Expired GB466981A (en) 1935-04-08 1936-03-27 Improvements in or relating to antenna coupling devices

Country Status (2)

Country Link
US (1) US2050912A (en)
GB (1) GB466981A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740682C (en) * 1940-04-19 1943-10-26 Licht Und Kraft Ag Input circuit for overlay receivers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL65133C (en) * 1943-03-03
US2617927A (en) * 1945-11-09 1952-11-11 Sissman Louise Interference eliminating system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE740682C (en) * 1940-04-19 1943-10-26 Licht Und Kraft Ag Input circuit for overlay receivers

Also Published As

Publication number Publication date
US2050912A (en) 1936-08-11

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